Related Experiment Video
Updated: Jan 18, 2026
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.6K
Chiral Phonon-Induced Spin Transport via Microscopic Barnett Effect
Xixi Qin1,2, Cong Yang3,4, Dali Sun4,5
1Duke University, Thomas Lord Department of Mechanical Engineering and Materials Science, Durham, North Carolina 27708, USA.
Physical Review Letters
|September 10, 2025
Summary
Chiral phonons enable angular momentum transfer for spin transport. This study reveals their role in generating spin currents in hybrid organic-inorganic perovskites (HOIPs), consistent with experiments.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Chiral phonons exhibit rotational atomic motion, facilitating angular momentum transfer.
- Understanding chiral phonon roles in spin dynamics is crucial for spintronics.
Purpose of the Study:
- Investigate chiral phonon emergence in chiral hybrid organic-inorganic perovskites (HOIPs).
- Explore chiral phonons' roles in rigid-body rotation, magnetic moment generation, and spin transport.
- Propose mechanisms for spin current generation and detection.
Main Methods:
- Theoretical investigation of chiral phonons in HOIPs.
- Microscopic Barnett effect modeling for spin chemical potential modification.
- Analysis of spin current induction at metal/HOIP interfaces.
Main Results:
- Chiral phonons induce a spatially varying spin chemical potential at the metal/HOIP interface.
- This leads to spin currents in adjacent copper layers, matching experimental data.
- A mechanism for intrinsic spin current excitation by chiral phonons under a parabolic temperature profile is proposed.
Conclusions:
- Chiral phonons are key to spin transport phenomena in HOIPs.
- The study provides a microscopic understanding of phonon-angular momentum-spin interactions.
- Experimental approaches for probing chiral phonons are suggested.
Related Concept Videos
01:27π Electron Effects on Chemical Shift: Overview
1.6K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.6K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.9K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.9K
01:17Spin–Spin Coupling: One-Bond Coupling
1.4K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.4K
01:08NMR Spectroscopy: Spin–Spin Coupling
3.0K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.0K
01:08Spin–Spin Coupling Constant: Overview
1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
2.3K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.3K